JVM_IR: use non-nullable types as SAM super types

The wrappers for conversions to nullable and non-nullable SAM types are
the same, so differentiating those has no effect other than class name
collisions.

compiler/testData/codegen/box/sam/nonInlinedSamWrapper.kt

@@ -0,0 +1,22 @@
+// IGNORE_BACKEND_FIR: JVM_IR
+// TARGET_BACKEND: JVM
+// WITH_RUNTIME
+// FILE: Test.java
+
+public class Test {
+    public static void run(Runnable r) {
+        r.run();
+    }
+}
+
+// FILE: test.kt
+
+fun runFunction1(x: () -> Unit) = Runnable(x).run()
+fun runFunction2(x: () -> Unit) = Test.run(x)
+
+fun box(): String {
+    var result = ""
+    runFunction1 { result += "O" }
+    runFunction2 { result += "K" }
+    return result
+}